Ledgestalling and IDC. And EDC which cannot effectively be banned. Why not just take it a step further. He breaks CP system? Remove him from half of it.
I repeat, Ledgestalling is not only related to Meta Knight. Other characters are able to do this, for instance Mr. Game & Watch.
IDC is a broken technique that has been banned. Just like Sonic's Home Attack-stalling. This doesn't make Meta Knight more broken, since the IDC doesn't matter
anyway, considering it's banned.
That was banning this
technique, not putting a handicap on Meta Knight as character. The technique is clearly broken > ban it. No matter who is doing it. If Wario would have some instant waft charging, that probably would be banned too (depending on how much it would affect the game, which probably would be quite a lot).
I haven't put much research into EDC, to be honest, since it's a rather recent discovery.
Putting a handicap of whatever kind (actual damage handicap, having him not ban stages, having him not being able to switch character or whatever else), however, does admit that the
character is broken.
Because you don't erase a certain technique, but cripple the
character himself and with this, the player.